The Los Angeles Art Organ Company originally published this 32-page booklet on the Grand Concert Organ they erected in Festival Hall at the 1904 St. Louis World's Fair. Included with this reprint is a Scientific American spread (April 23, 1904) that tells the story of the World's Largest Organ and includes a factory tour. Included in the booklet is a complete specification of the World's Fair organ and rare factory photos. Both are available in facsimile reprints from the Friends of the Wanamaker Organ Press. A must for Wanamaker Organ collectors!